The good: a very good cleaning job on a very dirty interior - I honestly didn't think they could get it looking this good. The guys were friendly, enthusiastic, and clearly worked hard. The "lounge" (with TV and Wi-Fi) is a nice touch, though it looks a bit unfinished.
The not-so-good: the seats (and the inside of the windshield) were left completely wet. They told me to blast the heat for half an hour with the window open a crack, but this didn't do the trick. It took days for the back seat to dry. I would have been happy to leave the car there longer and get it back dry, or at least drier. This is a relatively minor quibble, but it's what keeps U AutoSpa from getting 5 stars from me.